// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef sys_info_h
#define sys_info_h

#if V8_OS_POSIX
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#endif

#if V8_OS_BSD
#include <sys/sysctl.h>
#endif

#include <limits>

//#include "src/base/logging.h"
//#include "src/base/macros.h"
#if 1//V8_OS_WIN
//#include "src/base/win32-headers.h"
#include <windows.h>
#endif

namespace v8 {
  namespace base {
    class SysInfo {
    public:
      static int SysInfo::NumberOfProcessors() {
#if V8_OS_OPENBSD
        int mib[2] = { CTL_HW, HW_NCPU };
        int ncpu = 0;
        size_t len = sizeof(ncpu);
        if (sysctl(mib, arraysize(mib), &ncpu, &len, NULL, 0) != 0) {
          return 1;
        }
        return ncpu;
#elif V8_OS_POSIX
        long result = sysconf(_SC_NPROCESSORS_ONLN);  // NOLINT(runtime/int)
        if (result == -1) {
          return 1;
        }
        return static_cast<int>(result);
#elif V8_OS_WIN
        SYSTEM_INFO system_info = {};
        ::GetNativeSystemInfo(&system_info);
        return static_cast<int>(system_info.dwNumberOfProcessors);
#endif
      }

      static int64_t SysInfo::AmountOfPhysicalMemory() {
#if V8_OS_MACOSX
        int mib[2] = { CTL_HW, HW_MEMSIZE };
        int64_t memsize = 0;
        size_t len = sizeof(memsize);
        if (sysctl(mib, arraysize(mib), &memsize, &len, NULL, 0) != 0) {
          return 0;
        }
        return memsize;
#elif V8_OS_FREEBSD
        int pages, page_size;
        size_t size = sizeof(pages);
        sysctlbyname("vm.stats.vm.v_page_count", &pages, &size, NULL, 0);
        sysctlbyname("vm.stats.vm.v_page_size", &page_size, &size, NULL, 0);
        if (pages == -1 || page_size == -1) {
          return 0;
        }
        return static_cast<int64_t>(pages)* page_size;
#elif 1 // V8_OS_CYGWIN || V8_OS_WIN
        
        MEMORYSTATUSEX memory_info;
        memory_info.dwLength = sizeof(memory_info);
        if (!GlobalMemoryStatusEx(&memory_info)) {
          return 0;
        }
        int64_t result = static_cast<int64_t>(memory_info.ullTotalPhys);
        if (result < 0) result = std::numeric_limits<int64_t>::max();
        return result;
#elif V8_OS_QNX
        struct stat stat_buf;
        if (stat("/proc", &stat_buf) != 0) {
          return 0;
        }
        return static_cast<int64_t>(stat_buf.st_size);
#elif V8_OS_NACL
        // No support for _SC_PHYS_PAGES, assume 2GB.
        return static_cast<int64_t>(1) << 31;
#elif V8_OS_AIX
        int64_t result = sysconf(_SC_AIX_REALMEM);
        return static_cast<int64_t>(result)* 1024L;
#elif V8_OS_POSIX
        long pages = sysconf(_SC_PHYS_PAGES);    // NOLINT(runtime/int)
        long page_size = sysconf(_SC_PAGESIZE);  // NOLINT(runtime/int)
        if (pages == -1 || page_size == -1) {
          return 0;
        }
        return static_cast<int64_t>(pages)* page_size;
#endif
      }

      static int64_t SysInfo::AmountOfVirtualMemory() {
#if 1//V8_OS_NACL || V8_OS_WIN
        return 0;
#elif V8_OS_POSIX
        struct rlimit rlim;
        int result = getrlimit(RLIMIT_DATA, &rlim);
        if (result != 0) {
          return 0;
        }
        return (rlim.rlim_cur == RLIM_INFINITY) ? 0 : rlim.rlim_cur;
#endif
      }

    }; // SysInfo

  }  // namespace base
}  // namespace v8

#endif // sys_info_h